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Close PR#1455. In a couple of weeks, I'll change bsd.lib.mk to use

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tsort -q as well - I don't feel like adding tsort as Yet Another Item to the
bootstrap target.
This commit is contained in:
jkh 1996-08-02 04:50:44 +00:00
parent ed8692f377
commit 6d6a5bd8e1
2 changed files with 21 additions and 11 deletions
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5
usr.bin/tsort/tsort.1
View File

@ -44,6 +44,7 @@
.Nm tsort
.Op Fl d
.Op Fl l
.Op Fl q
.Op Ar file
.Sh DESCRIPTION
.Nm Tsort
@ -72,6 +73,10 @@ Turn on debugging.
.It Fl l
Search for and display the longest cycle.
Can take a very long time.
.It Fl q
Do not display informational messages about cycles. This is primarily
intended for building libraries, where optimal ordering is not critical,
and cycles occur often.
.El
.Sh SEE ALSO
.Xr ar 1

27
usr.bin/tsort/tsort.c
View File

@ -33,7 +33,7 @@
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id$
* $Id: tsort.c,v 1.3 1996/06/10 16:12:43 phk Exp $
*/
#ifndef lint
@ -43,7 +43,7 @@ static char copyright[] =
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)tsort.c 8.2 (Berkeley) 3/30/94";
static char sccsid[] = "@(#)tsort.c 8.3 (Berkeley) 5/4/95";
#endif /* not lint */
#include <sys/types.h>
@ -63,7 +63,7 @@ static char sccsid[] = "@(#)tsort.c 8.2 (Berkeley) 3/30/94";
* standard output in sorted order, one per line.
*
* usage:
* tsort [-l] [inputfile]
* tsort [-dlq] [inputfile]
* If no input file is specified, standard input is read.
*
* Should be compatable with AT&T tsort HOWEVER the output is not identical
@ -100,7 +100,7 @@ typedef struct _buf {
DB *db;
NODE *graph, **cycle_buf, **longest_cycle;
int debug, longest;
int debug, longest, quiet;
void add_arc __P((char *, char *));
int find_cycle __P((NODE *, NODE *, int, int));
@ -121,7 +121,7 @@ main(argc, argv)
int bsize, ch, nused;
BUF bufs[2];
while ((ch = getopt(argc, argv, "dl")) != EOF)
while ((ch = getopt(argc, argv, "dlq")) != EOF)
switch (ch) {
case 'd':
debug = 1;
@ -129,6 +129,9 @@ main(argc, argv)
case 'l':
longest = 1;
break;
case 'q':
quiet = 1;
break;
case '?':
default:
usage();
@ -337,11 +340,13 @@ tsort()
}
for (n = graph; n != NULL; n = n->n_next)
if (!(n->n_flags & NF_ACYCLIC))
if (cnt = find_cycle(n, n, 0, 0)) {
warnx("cycle in data");
for (i = 0; i < cnt; i++)
warnx("%s",
longest_cycle[i]->n_name);
if ((cnt = find_cycle(n, n, 0, 0))) {
if (!quiet) {
warnx("cycle in data");
for (i = 0; i < cnt; i++)
warnx("%s",
longest_cycle[i]->n_name);
}
remove_node(n);
clear_cycle();
break;
@ -426,6 +431,6 @@ find_cycle(from, to, longest_len, depth)
void
usage()
{
(void)fprintf(stderr, "usage: tsort [-dl] [file]\n");
(void)fprintf(stderr, "usage: tsort [-dlq] [file]\n");
exit(1);
}